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AssigneeMunicipal Services Corp.
InventorsFrederick H. Gustin, Hugh P. Shannonhouse, Robert W. Styron
Estimating the term…
Municipal solid waste ash is utilized in the manufacture of an aggregate and is processed to form a cold bonded pellet which, when tested by means of TCLP leaching extraction tests using TCLP No. 2 extraction fluid, does not exceed the 1990 limits for the RCRA priority heavy metals. The pellets may be surface coated with defined agents to seal the pellet or to provide properties which enhance the use of the pellet in either asphaltic or cement concrete mixes. A method of utilizing MSW ash includes the steps of collecting the bottom ash and fly ash components, processing the bottom ash component to remove unprocessible material and crushing the crushable component to a desired size, magnetically separating the magnetic material from at least the processed bottom ash component, treating at least the fly ash component of the ash with alkali silicate to fix the heavy metals, and utilizing the processed ash such as by adding cement or other binders in a mix to form pellets having an early strength sufficient to permit handling after 24 hours. Pellets may be treated with selective components and coatings to enhance the pellet's use as an aggregate in asphaltic or cement concrete mixes.
A cold bonded aggregate for a concrete mix in the form of a pellet comprising a body of processed ash residue from the incineration of municipal solid waste in which the heavy metal content of said ash residue has been fixed by an alkali metal fixative and said body is bonded by a cementitious binder, and having a hard sealing coating formed on the outer surface of the pellet body which is compatible with said concrete mix.
A cold bonded pellet-type aggregate for use with concrete mixes in which the pellets forming said aggregate comprise a cured mix of cementitious material and processed municipal solid waste ash having a maximum size of about number 4 mesh, said ash containing heavy metal components and including a bottom ash fraction and fly ash fraction in which at least said fly ash fraction is fixed with an alkali metal silicate fixative, and in which said pellet when ground to a minus 100 mesh and subjected to leaching tests using TCLP Fluid No. 2 according to Environmental Protection Agency Method No. 1311 as defined in Volume 51, Federal Register, page 21648 of Jun. 13, 1986 do not exceed the limits for each of the RCRA priority heavy metals as follows:
The method of utilizing ash formed by the incineration of municipal solid wastes, in which said ash includes a bottom ash component and a fly ash component, into a useful and environmentally safe building component, comprising the steps of:
A cold bonded aggregate for use with asphaltic concrete mixes in the form of a pellet in which said pellet comprises a body having processed ash residue from the incineration of municipal solid waste and a cementitious binder, and having a sealing coating on the outer surface of said pellet formed of hydrolyzed powdered quick lime.
A cold bonded aggregate for use with Portland cement concrete mixes in the form of a pellet in which said pellet comprises a body having processed ash residue from the incineration of municipal solid waste and a cementitious binder, and having a hard coating on the outer surface of said pellet formed of a hardened blend of cement and clay.
Dependencies are inferred from the claim text.